WikiVet English

Changes

Trichostrongyloidea - Overview (view source)

Revision as of 13:05, 20 July 2012

284 bytes added ,  13:05, 20 July 2012
no edit summary
Line 1: Line 1: −
== General Appearance ==
+
{{OpenPagesTop}}
 
[[Image:Trichostrongylus.jpg|thumb|right|150px|''Trichostrongylus'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
 
[[Image:Trichostrongylus.jpg|thumb|right|150px|''Trichostrongylus'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
−
*Bursate
+
==Introduction==
−
*Most members of this superfamily look like short lengths of cotton (typically 0.5-2cm)
+
Trichostrongyloidea are a bursate [[Nematodes|nematodes]], with ''[[Dictyocaulus]]'' forming the only exception. Important genera include ''[[Ostertagia]]'', ''[[Haemonchus]]'' and ''Trichostrongylus.''
−
*The spicules of each species have a characteristic shape
  −
*The heads have no distinct features
      
== General Life-Cycle ==
 
== General Life-Cycle ==
−
*The egg is approximately 80µm long, oval, thin-shelled, contains 4-16cells (i.e. it is a typical strongyle egg)
+
The life cycle of Trichostrongyloidea is direct, and infection is through ingestion of L3.
−
*Egg → L1 → L2 → L3 (this occurs on the ground)
  −
*L1 and L2 feed on bacteria
  −
*L3 is the infective stage
  −
*L3 is ensheathed (i.e. the L2 cuticle is retained after moulting as an "outer skin")
  −
*L3 cannot feed, but contains a finite amount of stored food to provide energy for movement
  −
*Infection is by ingestion of the L3
  −
*L3 → L4 → adult (this occurs in the stomach or small intestine)
  −
*Parasitic development initially occurs in gastric glands or intestinal crypts (depending on species)
  −
*Adults are situated on the mucosal surface
  −
*The prepatent period is typically about 3 weeks
      +
The egg is approximately 80µm long, oval, thin-shelled, and containing 4-16 cells, so is a typical strongyle egg.
 +
 +
Egg → L1 → L2 → L3 occurs on the ground. L1 and L2 feed on bacteria, and L3 is exsheathed and represents the infective stage. L3 cannot feed, but do contain a finite amount of stored food to provide energy for movement. Infection is via ingestion of the L3.  L3 → L4 → adult, these stages generally occur in the stomach or small intestine.
 +
 +
Parasitic development initially occurs in gastric glands or intestinal crypts, species dependent. Adults are generally found on the mucosal surface, and the prepatent period is typically about 3 weeks.
 +
 +
{{Learning
 +
|literature search = [http://www.cabdirect.org/search.html?q=id:(%22Trichostrongyloidea%22)+AND+title:(%22life+cycle%22) Trichostrongyloidea life cycle publications]
 +
}}
 +
 +
 +
{{review}}
 +
 +
{{OpenPages}}
       
[[Category:Trichostrongyloidea|A]]
 
[[Category:Trichostrongyloidea|A]]
−
[[Category:To_Do_-_Parasites]]
+
 
 +
[[Category:Expert Review]]
Bara
Author, Donkey, Bureaucrats, Administrators
53,803

edits

Retrieved from "https://en.wikivet.net/Special:MobileDiff/78923...141361"